I don't really think a beast race would be suited or proper for the game. However, I wouldn't mind more of a furry humanoid race, which would really suit the game and wouldn't be too hard to make armor models for.
Those who say Viera look like Elezen with bunny ears are silly. Their bodies and faces are completely different, where elezen have a kind of caved in face the Viera have a completely pushed out face.
Instead of a "beast" we can have a more animal look to them like this.
http://40.media.tumblr.com/2425607f1...rxc0lo_500.png
A mix between both of these, where the faces are longer or more bunny-like.